Door lock



May 28; 1940.

f J. F. cHlNG DOOR LOCK Filed Feb. 20. 1939 2 Sheets-Sheet l AVVENYUR May 2s, 19210.A

J.. F. HlNG 2,202,086

DOOR LOCK Filed Feb. 2d, '1939 2 sheets-sheet 2 :EIEL

/9 lz-4426 f E; 35 2 362653 /al 5% Patented Mey 2s, 1940 2,202,081

2,202,086 Doon LOCK John F. Ching, Berkeley, Calif.

Application February 20, 1939, Serial No. 257,409

4 Claims. (Cl. 292-359) This invention relates to looks to prevent the mechanism described so far constitutes the standopening of doors. ard parts found in most common door latches.

An object of the invention is to provide an im- The mechanism l' will now describe constitutes plO-Ved construction for keyless door locks. the improved lock of my invention to be used with Another object or the invention is to provide a the type of door latch set forth above and iS par- 5 lock for doors Whose mechanism is entirely eohticularly intended for use on interior doors or the centric with the knob shaft, inner side of outlet doors. The structure of Fig- A further object of the invention is to provide ure 5 shows an inner door and is provided with a locking mechanism for doors which may be duplicate locks, but since both lock mechanisms quickly incorporated in door latches not originalare identical .only One Will be deSCrheCl n detail- ,l0 ly provided With locking means. Secured to a face of the door by Wood screws -IS The invention possesses other objects and feaiS an eSCutCheOn plate 2| having e Central Opentures of advantage some of which, together .with ing 22 in WhlCh iS positioned a Cyllndrelhub 23 the foregoing, will be specifically set forth in the having an aperture 24 therein thrOugh Which the detailed description of the invention hereunto anshaft i6 paSSeS and n WhCh the latter iS freely l5 nexed. It is to be understood that the invention rOtatehle. The huh 23 iS provided With a ShOulis not to be iimited to the specio form thereof der 2t, engaging One surface 0f the eseuteheon herein shown and described as various other emplate bordering the opening 22, and with an eX- bodiments thereof may be employed Within the teneon Which iS Spun Over t0 fOrm a ange 2l enscope of the appended claims. gaging the opposite surface of the escutcheon 20 Referring to the drawings: plate bordering the opening 22 so as to securely Figure 1 is a front elevational view of a secx the hub to the eseuteheerl plate and against tion of a door showing my improved door look rotation in the opening 22- The hub iS e150 promounted thereon. Portions of the vievv are shown vided, aS iS best ShOWn in Figure 6, With an arouin vertical section and the plane in which the ate ridge 23, which eXtendS through I10tqute 180 25 View is taken is indicated by the line I-l of degrees of arc on the periphery of the hub, with Figure 5. a lock pin aperture 29, which is radially spaced Figure 2 is a front elevational view of the lock from and parallels the aXS of the Shaft aperture knob. 2d, and With a circular recess 3| which is axially Figure 3 is a vertical sectional view of the lockconcentric with the aperture 24 and Wheh Opens 30 ing knob. The plane in which the view is taken toward the door 9. is indicated by the line 3 3 of Figure 2. Rotatably positioned in .the recess 3| is a cylin- Figure 4 is a rear elevational View of the lock drical rotor 32, best shown in Figures 7 and 8, knoll Which has a central rectangular opening 33, to re- Flgure 5 iS 21 vertleel SeCtOnel vleW 0f the ceive the square shaft Ii,a1ock pin aperture 34, 35 structure shown 1n Figure l. Portlons of the which is radially Offset from the axis of the r0 vietv are shown in elevation for .the sake of cleartm. a distance equal to the Offset of the aperture ness and the sectional portion of the View is taken 29 from the central axis of the hub 23 a reces-s 35 in the plane indicated by the line 5-5 of Figure 1 which is concentric With the aperture 34, and av peripheral bead 3l which is located at one end of -40 esftgcukgor 11mg from elevatlonal ew of the the rotor. The square shaft le ntting in the Figure 7 is a front elevational vievv of the shaft square Opening 33 of the rotor provides a driving 1.0mm connection between the shaft and rotor so that Figui-e 3 is a Vertical sectional View of the Shaft when the shaft is rotated the rotor Will also be rorotor. The plane of section is indicated by the tailed in the recess 3L Mounted lll-the ,I'eCeSS 45 line 8--8 0f Figure 7. 3S, for movement axially thereof, is a plunger 38 In detail, the door, indicated by the numeral 9, having a Stub eXtenSiOn 39 Which enters .and eXfis provided with the usual latch mechanism contends through the lock pin aperture 34, and a coil sisting of the housing Il, which lis mortised into spring 4l, contained in the recess36, has one end 50 an edge of the door, containing the retractible engaging the plunger 33 enel the Other end enlatch bolt I2 having the usual tail piece i3 engaging a circular disk 42 having a central opening gaged by the cam i4 which is actuated by the throughk which the shaft I6 passes and Whose shaft it upon rotation of either knob l1 secured9 peripheral portion is Spun over the bead 3l 0f the by setscrews I8,` to the ends of the shaft I6. The rotor so as to secure the disktothe rotor and to 55 retain the plunger 38 and the spring 4| in the recess 36.

Positioned concentrically with the hub 23, and having a complemental recess 43 into which the hub ts, is a lock knob 44 having, as is best shown in Figures 2, 3 and 4, a central bore 46, through which the shaft I6 passes and in which the latter is freely rotatable, and a concentric circular recess 41 which receives the shank 4S of the knob |1. Within the recess 43 is an arcuate groove 49, complemental with and into which the ridge 28 of the hub ts, and an arcuate cam recess 5| whose bottom 52 gradually slopes along its length in a direction parallel with the axis of the bore 46, that is, the cam recess 5| is deeper at one end than at the other. The mean radius of the cam recess 5| coincides with the axes of the lock pin apertures 29 and 34 of the hub 23 and the rotor 32 respectively. A radially extending operating handle 53 is also provided on the lock knob. As will b e seen in Figures 3 and 4, the groove 49 extends slightly less than 180 degrees around the periphery of the recess 43, the remainder 54 of said periphery which continues from the ends of the groove being recessed and open toward the rear end of the lock knob. Prior to connecting the lock knob 44 and the hub 23, a lock pin 56 is slipped into the alined lock pin apertures 29 and 34. The lock knob is then placedI over the hub with the operating handle 53 pointing downwardly. In this position, the ridge 26 of the hub enters the recessed portion 54 of the knob and the lock'pin 56 contacting the surface 51 of the knob Will be pushed inwardly, against the tension of the spring 4|, until its outer end coincides with the outer end surface of the hub. The knob is then rotated through an arc of about 180 degrees whereupon the ridge 28 of the hub will enter the complementary groove 49 therefor in the knob and the lock pin 56 upon coming into registry with an end of the cam recess 5| will snap outwardly thereinto. It will be seen therefore that the lock knob and the hub are secured together against relative axial movement by the intermeshed ridge 28 and groove 49 and that subsequent rotary movement of the knob on the hub is limited due to the fact that the lock pin is confined in the cam recess 5|. It will also be seen that the lock knob and hub may not thereafter be separated unless the entire mechanism is disassembled to remove the rotor 32 from the hub recess 3| so that the end of the lock pin may be Withdrawn from the cam recess 5| whereupon the lock knob and hub may be relatively rotated to disengage the ridge 28 from its mating groove 49,

As shown in the left-hand portion of Figure 5, the lock pin 56 is fully retracted, that is, its outer end is seated in the deepest portion of the cam groove 5| and the operating handle 53 is positioned as shown by the solid lines 58 of Figure 1. 'Ihis allows the knob I1, the shaft I6 and the rotor 32 carried thereby to be freely rotated so as to retract the latch bolt |2 to open the door. However, when the door is closed and the cperating handle is moved clockwise to the position indicated by the dotted lines 59 of Figure 1, the sloping bottom 52 of the cam groove 5| will be moved across the end of the lock pin until the pin is resting in the shallow end of the groove. This action will cause the lock pin 56 to be projected axially into the aperture 34 of the rotor and will simultaneously move the plunger 38 along the recess 36 compressing the spring 4| in so doing. This latter position of the lock pin is shown in the right-hand portion of Figure 5 and it will be seen that the normally rotatable rotor is now secured, against rotation, to the fixed hub 23 by the lock pin. Thus neither knob |1 may be rotated and the door is securely locked. Returning of the operating handle 53 to the position 58 of Figure l will allow the compressed spring 4| to move the plunger 38 so that the stub extension 39 thereof enters the rotor aperture 34 and pushes the end of the lock pin therefrom, the lock pin being then retracted since its outer end will be alined with and may pass into the deepest .end of the cam recess 5|.

It will be apparent, upon inspection of the drawings, that the improved lock of my invention may be quickly attached to any existing common door latch since none of the existing structure requires alteration of any kind, the only operation that is necessary is to remove the existing knob l1, replace the existing escutcheon plate with the escutcheon plate 2| bearing, as an integral unit, my improved lock, and replace the existing knob |1. It will also be seen that by providing both knobs of a door with my improved lock, as is shown in Figure 5, the door may be locked from either side so as to prevent entry of a person from the adjoining room, or both locks may be set so that the respective persons occupying adjoining rooms may not enter the respective rooms without their mutual consent.

Having thus described my invention, what I claim as new and desire to secure by Letters Pat- .ent is:

l. In a door lock, including a shaft rotatable to move a latch bolt, a xed member having therein a lock element spaced from the axis of said shaft, a rotor on and rotatable with said shaft having a lock element therein movable therewith in an orbit about the axis of said shaft and registrable with the lock element of said fixed member during said movement, a lock pin movable through the lock element of said xed member and into the lock element of said rotor to secure said fixed member and said rotor together against relative rotation, and pressure actuated means for moving said lock pin out of the lock element of said rotor.

2. In a door lock, including a shaft rotatable to vmove a latch bolt, a fixed hub concentric with said shaft, said hub having an axially oifset aperture therein, a rotor journaled in said hub, secured for rotation with said shaft and having therein an axially oiset aperture registrable with the hub aperture, a lock pin slidable in said hub aperture to enter said rotor aperture whereby said hub and rotor are locked together against relative rotation, a lock knob concentric with and journaled for rotary motion on said hub, means securing said lock knob and said hub together against axial displacement, a cam on said lock knob engaging an end of said lock pin whereby upon rotary motion of said lock knob said lock pin will be moved into said rotor aperture, and spring-pressed means in said rotor for moving said lock pin out of said rotor aperture.

3. In a door lock, including a shaft rotatable to move a latch bolt, a fixed hub concentric with said shaft. said hub having an axially offset aperture therein, a rotor journaled in said hub, secured for rotation with'said shaft and having therein an axially oiset aperture registrable With the hub aperture, a lock pin slidable in said hub aperture to enter said rotor aperture whereby said hub and rotor are locked together against relative rotation, a lock knob concentric with and journaled for rotary motion on said hub, means securing said lock knob and said hub together against axial displacement, a cam on said lock knob engaging an end of said lock pin whereby upon rotary motion of said lock knob said lock pin will be moved into said rotor aperture, a plunger slidably mounted in said rotor to enter said rotor aperture, and a `spring engaging said plunger to urge the latter into said rotor aperture.

4. In a door lock, including a shaft rotatable to move a latch bolt, a xed hub concentric with said shaft, said hub having an axially oifset bottom of said recess. v y .JOI-IN F. CI-DNG. l 9.0

mounted in said recess and having a stub exten' sion to enter said rotor aperture, a spring in said rotor recess engaging said plunger to urge the stub extension thereof into said rotor aperture, 'a cover plate on said rotor closing said rotor recess and engaged by said spring, a lock pin slidably mounted in said hub aperture, one end of said lock pin being capable of entry into said rotor aperture to lock the hub and rotor together against relative rotation, a lock knobI journaled on said hub, said lock knob having therein a groove, comple-mental to and in Whichthe peripheral ridge of the hub isslidably engaged, and an ar'- cuate recess having a depth gradually increasing vfrom end to end and having its mean radius equal to the oset distance of thehub and rotor apertures from the axis of said shaft, and an end of said lock pin being in engagement With the 

